Ignition distributor for internal combustion engines

Abstract

The control generator of an ignition distributor for a transistor-coil ignition comprises an annular coil (55), a rotor (54) and a stator, which is a riveted unit comprising a stator plate (18), a permanent magnet (17) and a pole disc (56). The rotor and the pole disc are molded elements of sintered iron or of a mixture of sintered iron powder and carbonyl iron powder having a binder of thermosetting resin. The rotor and the pole disc have cooperating pole teeth (59,51), which are directed parallel to the axis (60) and whose cross section is triangular, with the triangular tips oriented toward one another. These "pointed teeth" produce a more steeply inclined signal course, as a result of which a decreased inherent shifting of the inductive transducer, and thereby more reliable starting of the engine, are attained.

We claim: 
     
       1. In an ignition distributor for internal combustion engines, a control generator having an annular coil (55), a rotor (54) and a stator which includes an annular permanent magnet (17), a stator plate (18) and a pole disc (56), said rotor (54) having a slotted annular plate portion on the inner rim of which a hub (63) is formed and pole teeth (59) extending axially from the outer rim of said plate portion which are made integrally with said plate portion and are of triangular cross-section in a radial plane,   said stator pole disc (56) being riveted to said stator (18) with said permanent magnet disposed therebetween, and having an annular plate portion (52) and axially prolonged teeth (51) extending axially from the outer rim thereof which are made integrally with said annular plate portion (52) of said pole disc and are of triangular cross-section in a radial plane,   said rotor pole teeth (59) and said stator pole teeth (51) partially overlapping each other and having their respective tips of triangular cross-section oriented towards each other and disposed for forming a working air gap in passing by each other, and   at least one of said rotor (54) and said stator pole disc (56) being molded of sintered iron.   
     
     
       2. A control generator in an ignition distributor according to claim 1, in which at least one of said rotor (54) and said stator pole disc (56) is a part made of a sintered mixture of iron powder, carbonyl iron powder and a binder of thermosetting resin. 
     
     
       3. A control generator in an ignition distributor according to claim 1, in which a coil shell body (69) is provided for said annular coil (55), said coil shell body being U-shaped in its radial section and having a first flange (70) nearer said pole disc (56) and a second flange (71) nearer said rotor (54) which has an outer diameter smaller than that of said first flange.